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Title: Pesa Large Red Dry Bean

item Nchimbi-msolla, Susan
item Misangu, Robert
item Mabagala, Robert
item Magayane, Flavianus
item Kweka, Sostenus
item Butler, Lorna
item Miklas, Phillip - Phil
item Myers, James

Submitted to: Bean Improvement Cooperative Annual Report
Publication Type: Germplasm Release
Publication Acceptance Date: 2/1/2008
Publication Date: 4/1/2008
Citation: Nchimbi-Msolla, S., Misangu, R., Mabagala, R., Magayane, F., Kweka, S., Butler, L.M., Miklas, P.N., Myers, J.R. 2008. Pesa Large Red Dry Bean. Bean Improvement Cooperative Annual Report. 51:280-281.

Interpretive Summary: USDA-ARS, Prosser, WA, has been actively involved in the Bean/Cowpea CRSP Project sponsored by US-AID covering genetic improvement of dry beans for Eastern and Southern Africa for more than 25 years. The new cultivar Pesa with improved disease resistance and higher yield for production in Tanzania culminates years of cooperative breeding and testing among project participants from Universities in the U.S. and Tanzania. This new variety Pesa will help subsistence growers in East Africa to achieve higher yield potential with their dry bean crops which should lead to greater on farm income and more beans available for family consumption.

Technical Abstract: Released in 2006, Pesa was derived from the single cross Rojo x Kablanketi made in Dec-Jan 1992-93. The parent ‘Rojo’ is a large red-seeded cultivar released by SUA in 1997. It has I bc-12 resistance to BCMV and BCMNV, resistance to the prevalent races of ALS, and moderate resistance to CBB, and HB races. It was derived from a cross between SUA 90 and 86EP5034-B. SUA 90 was developed at CIAT (accession number G5476) and distributed in Africa with the designation TMO 216. 86EP5034-B has a complex pedigree containing a mix of dry bean and snap bean sources of germplasm. Kablanketi is a landrace from Zambia. Pesa out-yielded the check Kenya in nine of 12 trials and had an overall yield advantage of 109%. Overall yields were similar in researcher’s plots compared to on-farm trials. Pesa has an erect determinate bush (Type I) growth habit. Plants average 44 cm in height and have an average of three main nodes and four branches. Seed of Pesa is medium-sized (averaging 36.8 g 100 seeds-1) By comparison Kenya had mean seed sizes of 36.4 g 100 seeds-1. Seed of Pesa has similar color to Rojo, but more spherical in shape. Overall, farmers found Pesa to meet their criteria for a palatable cultivar with high potential for marketability.